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Summary Of Significant Accounting Policies (Marketable Securities - Amortized Cost and Fair Value) (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost $ 49,738
Gross unrealized gains 0
Gross unrealized losses (122)
Fair value 49,616
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis 18,585
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 18,549
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis 31,153
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value 31,067
Certificates of Deposit [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost 681
Gross unrealized gains 0
Gross unrealized losses 0
Fair value 681
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost 11,945
Gross unrealized gains 0
Gross unrealized losses (20)
Fair value 11,925
Corporate Bond Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost 34,701
Gross unrealized gains 0
Gross unrealized losses (100)
Fair value 34,601
US Government Agencies Debt Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost 2,411
Gross unrealized gains 0
Gross unrealized losses (2)
Fair value $ 2,409